The c-c++-common/attr-nonstring-3.c test has run afoul of c++ bug 74762 (missing uninitialized warning (C++, parenthesized expr, TREE_NO_WARNING)). Until that bug is fixed, I've committed r256709 and xfailed the two assertions that started failing after r256683, as a result of gating middle-end warnings on the no-warning bit being clear.
Martin
